'\" te
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.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
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.TH DECIMAL_TO_FLOATING 3C "Oct 1, 2001"
.SH NAME
decimal_to_floating, decimal_to_single, decimal_to_double, decimal_to_extended,
decimal_to_quadruple \- convert decimal record to floating-point value
.SH SYNOPSIS
.LP
.nf
#include <floatingpoint.h>

\fBvoid\fR \fBdecimal_to_single\fR(\fBsingle *\fR\fIpx\fR, \fBdecimal_mode *\fR\fIpm\fR,
     \fBdecimal_record *\fR\fIpd\fR, \fBfp_exception_field_type *\fR\fIps\fR);
.fi

.LP
.nf
\fBvoid\fR \fBdecimal_to_double\fR(\fBdouble *\fR\fIpx\fR, \fBdecimal_mode *\fR\fIpm\fR,
     \fBdecimal_record *\fR\fIpd\fR, \fBfp_exception_field_type *\fR\fIps\fR);
.fi

.LP
.nf
\fBvoid\fR \fBdecimal_to_extended\fR(\fBextended *\fR\fIpx\fR, \fBdecimal_mode *\fR\fIpm\fR,
     \fBdecimal_record *\fR\fIpd\fR, \fBfp_exception_field_type *\fR\fIps\fR);
.fi

.LP
.nf
\fBvoid\fR \fBdecimal_to_quadruple\fR(\fBquadruple *\fR\fIpx\fR, \fBdecimal_mode *\fR\fIpm\fR,
     \fBdecimal_record *\fR\fIpd\fR, \fBfp_exception_field_type *\fR\fIps\fR);
.fi

.SH DESCRIPTION
.sp
.LP
These functions convert the decimal record *\fIpd\fR to a floating-point value
*\fIpx\fR observing the rounding direction specified in *\fIpm\fR and setting
*\fIps\fR to reflect any floating-point exceptions that occur.
.sp
.LP
When \fIpd\fR->\fBfpclass\fR is \fBfp_zero\fR, \fBfp_infinity\fR,
\fBfp_quiet\fR, or \fBfp_signaling\fR, *\fIpx\fR is set to zero, infinity, a
quiet NaN, or a signaling NaN, respectively, with the sign indicated by
\fIpd\fR->\fBsign\fR. All other fields in *\fIpd\fR are ignored.
.sp
.LP
When \fIpd\fR->\fBfpclass\fR is \fBfp_normal\fR or \fBfp_subnormal\fR,
\fIpd\fR->\fBds\fR must contain a null-terminated string of one or more ASCII
digits representing a non-zero integer \fIm\fR, and \fIpd\fR->\fBndigits\fR
must be equal to the length of this string. Then *\fIpx\fR is set to a
correctly rounded approximation to
.sp
.in +2
.nf
\(mi1**(pd->sign) * m * 10**(pd->exponent)
.fi
.in -2

.sp
.LP
\fIpd\fR->\fBmore\fR can be set to a non-zero value to indicate that
insignificant trailing digits were omitted from \fIpd\fR->\fBds\fR. In this
case, \fIm\fR is replaced by \fIm\fR + \fIdelta\fR in the expression above,
where \fIdelta\fR is some tiny positive fraction.
.sp
.LP
The converted value is rounded according to the rounding direction specified in
\fIpm\fR->\fBrd\fR. \fIpm\fR->\fBdf\fR and \fIpm\fR->\fBndigits\fR are not
used.
.sp
.LP
On exit, *\fIps\fR contains a bitwise OR of flags corresponding to any
floating-point exceptions that occurred. The only possible exceptions are
underflow, overflow, and inexact.  If no floating-point exceptions occurred,
*\fIps\fR is set to zero.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR scanf (3C),
.BR string_to_decimal (3C),
.BR strtod (3C),
.BR attributes (7)
